import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class TcpEchoClient {
    private Socket socket = null;

    public TcpEchoClient(String serverIp, int serverPort) throws IOException {
        // new对象构造的过程就会触发TCP建立连接的过程
        socket = new Socket(serverIp,serverPort);
    }

    private void start() {
        System.out.println("客户端启动！");
        Scanner scanner = new Scanner(System.in);
        try(InputStream inputStream = socket.getInputStream();
            OutputStream outputStream = socket.getOutputStream()){
            while(true){
                // 1，从键盘上读取用户输入的内容
                System.out.print("> ");
                String request = scanner.next();
                if(request.equals("exit")){
                    System.out.println("客户端关闭！");
                    break;
                }
                // 2，把读取的内容构造成请求，发送给服务器
                PrintWriter printWriter = new PrintWriter(outputStream);
                printWriter.println(request);
                printWriter.flush();
                // 3，读取服务器的响应
                Scanner respScanner = new Scanner(inputStream);
                String response = respScanner.next();
                // 4，把响应内容显示到界面上
                System.out.println(response);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void main(String[] args) throws IOException {
        TcpEchoClient tcpEchoClient = new TcpEchoClient("127.0.0.1",9090);
        tcpEchoClient.start();
    }
}
